Camshaft adjusting system with flex pot for decoupling of the adjustment ranges

Abstract

A camshaft adjusting system ( 1 ) is provided for a first camshaft ( 2 ) and a second camshaft ( 3 ) which are arranged concentrically with respect to one another, the second camshaft ( 3 ) being arranged within the first camshaft ( 2 ). A vane-cell type hydraulic camshaft adjuster ( 4 ) is configured for adjusting the first camshaft ( 2 ) and an electric camshaft adjuster ( 5 ) is configured for adjusting the second camshaft ( 3 ). A front cover ( 7 ) which is fastened to a stator ( 6 ) of the hydraulic camshaft adjuster ( 4 ) and which closes off the camshaft adjuster ( 4 ) at a side facing away from the camshaft has an internal toothing ( 8 ) for supporting a flex pot ( 9 ) which is attached to the second camshaft ( 3 ) and which is designed for receiving torque from the electric camshaft adjuster ( 5 ). A camshaft adjusting unit having the camshaft adjusting system ( 1 ) and two camshafts ( 2, 3 ) is also provided.

The invention claimed is: 
     
       1. A camshaft adjusting system for a first camshaft and a second camshaft which are arranged concentrically with respect to one another, the second camshaft being arranged within the first camshaft, the camshaft adjusting system comprising:
 a vane-cell type hydraulic camshaft adjuster configured for adjusting the first camshaft and including a stator and a front cover fastened to the stator that closes off the hydraulic camshaft adjuster at a side that is adapted to be facing away from the camshafts; 
 an electric camshaft adjuster configured for adjusting the second camshaft; 
 a flex pot which is configured to be attached to the second camshaft that receives torque from the electric camshaft adjuster; 
 the front cover includes an internal toothing that supports the flex pot. 
 
     
     
       2. The camshaft adjusting system as claimed in  claim 1 , wherein the front cover is an integral constituent part of the stator. 
     
     
       3. The camshaft adjusting system as claimed in  claim 1 , wherein the front cover is a component that is separate from the stator. 
     
     
       4. The camshaft adjusting system as claimed in  claim 1 , wherein the front cover includes a stop component and the internal toothing is separate from the stop component. 
     
     
       5. The camshaft adjusting system as claimed in  claim 4 , wherein the stop component has a shoulder which prevents an axial movement of at least one of the flex pot or a rolling bearing outer shell in the flex pot in a direction of an electric motor of the electric camshaft adjuster. 
     
     
       6. The camshaft adjusting system as claimed in  claim 4 , wherein the stop component engages around the front cover. 
     
     
       7. The camshaft adjusting system as claimed in  claim 6 , wherein a frictional engagement is formed between the stop component and the front cover. 
     
     
       8. The camshaft adjusting system as claimed in  claim 1 , wherein the front cover has both a stop and the internal toothing. 
     
     
       9. The camshaft adjusting system as claimed in  claim 8 , wherein the stop includes a shoulder which prevents an axial movement of at least one of the flex pot or a rolling bearing outer shell in the flex pot in a direction of an electric motor of the electric camshaft adjuster. 
     
     
       10. The camshaft adjusting system as claimed in  claim 1 , further comprising an adapter part for conducting oil arranged in an axial direction between a rotor of the hydraulic camshaft adjuster and the flex pot. 
     
     
       11. The camshaft adjusting system as claimed in  claim 1 , further comprising an intermediate part by which the flex pot is adapted to be connected to the second camshaft. 
     
     
       12. The camshaft adjusting system as claimed in  claim 1 , further comprising an Oldham coupling by which the electric camshaft adjuster is adapted to be connected to the second camshaft. 
     
     
       13. A camshaft adjusting unit comprising the camshaft adjusting system as claimed in  claim 1  and the first and second camshafts which are arranged concentrically with respect to one another. 
     
     
       14. A camshaft adjusting system comprising:
 a first camshaft; 
 a second camshaft arranged concentrically inside the first camshaft; 
 a vane-cell type hydraulic camshaft adjuster connected to the first camshaft and configured to adjust a relative rotational position of the first camshaft, the hydraulic camshaft adjuster including a stator and a front cover fastened to the stator that closes off the hydraulic camshaft adjuster at a side that is adapted to be facing away from the camshafts; 
 an electric camshaft adjuster connected to the second camshaft and configured to adjust a relative rotational position of the second camshaft; 
 a flex pot by which the second camshaft is connected to the electric camshaft adjuster, the flex pot receives torque from the electric camshaft adjuster; and 
 the front cover includes an internal toothing that supports the flex pot. 
 
     
     
       15. The camshaft adjusting unit as claimed in  claim 14 , wherein the front cover is an integral constituent part of the stator. 
     
     
       16. The camshaft adjusting unit as claimed in  claim 14 , wherein the front cover includes a stop component and the internal toothing which is separate from the stop component. 
     
     
       17. The camshaft adjusting unit as claimed in  claim 16 , wherein the stop component has a shoulder which prevents an axial movement of at least one of the flex pot or a rolling bearing outer shell in the flex pot in a direction of an electric motor of the electric camshaft adjuster. 
     
     
       18. The camshaft adjusting unit as claimed in  claim 14 , wherein the front cover has both a stop and the internal toothing. 
     
     
       19. The camshaft adjusting unit as claimed in  claim 18 , wherein the stop includes a shoulder which prevents an axial movement of at least one of the flex pot or a rolling bearing outer shell in the flex pot in a direction of an electric motor of the electric camshaft adjuster.